It's a player review addons, you can write review about people, share it automaticly with guild and friends and when you hover a player you will see in the tooltip if he have review.
Whelp unleash is a modification of the whelp addon that you can find here :
https://www.curseforge.com/wow/addons/whelp
It basically remove any artificial restriction from the addon, allowing you to write and read review for and from anyone, without the need of a party.